Cylinder liner



CYLINDER LINER Original Filed July 30, 1940 3 Sheets-Sheet l v a, W 74 Q", j GD 7 "'00xrlI// '4 I) I 4 mug Ilillllll #7 7 106 March 2, 1943. v R, HEFTLER 2,312,817

CYLINDER LINER Original Filed July 30, 1940 3 Sheets-Sheet 2 March 2, 1943. R HEFTLER 2,312,817

CYLINDER LINER Original Filed July 30, 1940 3 Sheets-Sheet 3 v 21 v V INVE I24 I 25 NT R Patented Mar. 2, 1943 UNITED STATES PATENT OFFICE CYLINDER LINER Victor B. Heftler, Grosse Pointe Park, Mich.

Original application July 30, 1940, Serial No. 348,431. Divided and this application January I, 1941, Serial No. 373,459

3' Claims. (01. 309-3) This application is a division of my co-pending application No. 348,431, filed July 30, 1940.

It is an object of this invention to provide a simple and inexpensive construction for the accelerating pump usually provided in carburetors, and to provide a novel mechanism for actuating said pump in which the ratio of pump delivery to throttle movement is greatest at low throttle.

Other novel features which may be disclosed herein but not claimed are claimed in my co-pending applications No. 348,431 filed July 30, 1940, and No. 373,460 filed January 7, 1941.

Fig. 1 is a side elevation of a carburetor embodying my invention, viewed from the lower side of Fi 2.

Fig. 2 is a plan view, with one-half of the cover removed.

Fig. 3 is a front elevation, viewed from the left side of Fig. 2, with some portions cut away to show the throttle in idling position and the piston of the accelerating pump in its upper position.

Fig. 4 is a fragmentary elevation, from the same point of View, with the pump parts in the lower position.

Fig. 5 is a so-called exploded view, in perspective and on an enlarged scale, of parts of the accelerating pump.

Fig. 6 is an elevation, viewed from the right side of Fig. 2, with some portions in cross section along parallel lines 6a, 6b, 6c and 6d of Fig. 2.

Fig. 7 is a partial cross section along the poly onal line T'I of Fig. 2.

Fig. 8 is a plan View of the combined washer and valve retainer.

This invention is described as applied to a down-draft carburetor, comprising a downwardly discharging throttle housing member 2 I, provided with a flange 22 for attachment to an engine manifold (not shown) in the well known manner, over which is secured a mixing chamber body member 23, which, in turn, sup-ports a cover member 24, these three main parts bein suitably fastened to one another, by screws 25 for instance. A heat insulating gasket 52 is preferably inserted between the throttle housing member 2| and the mixing chamber body member 23.

The air supply enters through a conduit 26 in the cover member 24, being controlled by a choke valve 21 actuated in any one of the ways now current and well known in the art. Conduit 26 registers with conduit 30 (Fig. 6) in the mixing chamber body member 23, which leads to conduit 3| in the throttle housing member 2|. A throttle valve 32, mounted on shaft 33, controls conduit 3| ture through the carburetor.

to restrict more or less the free passage of mix- The means used toactuate the throttle are not shown, they may consist of a lever, not shown, pinned or otherwise fastened to shaft 33. To limit the movement of the throttle, there is fastened on shaft 33 a lever 34 provided with two lugs 35 and 36. Lug 35 cooperates with stop pin 31 to limit the opening movement, while a screw 38 threaded in lug 36 co-operates with the part 39 to limit adjustably the closing movement of the throttle.

' Formed in the mixing chamber body member is a constant level fuel chamber 62, in which a level sensitive device controls a fuel inlet in the well known manner. In this illustration, there is used a pair of floats symmetrically located with reference to the median plane of the carburetor, one of which floats is shown at on Fig. 2.

The main normal mixture supply of fuel is effected through a double venturi shown on Fig. 6, but need not be described here, nor is it pertinent to describe in detail the provision made for idling or the provision of a control whereby said idling is rendered inoperative during deceleration, part of which control is illustrated in the lower portion of Fig. 6-.

To provide an additional supply of gasoline for acceleration, there is provided a pump, actuated by the throttle. Fig. 7 shows, in cross section, that the mixing chamber body member 23 is bored at H9 to receive a pump cylinder liner I20, a gasket I2I being placed between the end of said liner and the bottom of hole H9. To retain the liner I20 in position, there is used a split elastic ring I22, the free diameter of which is larger than the hole H9 so that it is necessary to elastically deform it to insert it into hole I I9; the pressure of the ring against the walls of the hole results in a frictional resistance to longitudinal movement amply sufiicient to hold the liner, which is a loose fit in hole H9, against the resistance of the compressed gasket I 2| and against the friction of pump piston I28 when the latter is moved upwards. A ball I23 in recess I24 forms a valve which opens to allow fuel to flow through channel I25 from the fuel chamber 62 into the pump but prevents reverse flow. To prevent too great a movement of the ball valve, it is retained in recess I24 by the gasket I2I which is provided with a diametral web I26 attached to the periphery, as shown in Fig. 8, which is a plan view of said gasket. As Fig. 7 is a cross section on a polygonal line, it is not possible to show on this figure how channel I25 is drilled from the outside of the casting, but reference IZI on Fig. 1, indicates both the start of said drilling and the plug used to close it.

A piston I28 is adapted to slide in the pump cylinder, being actuated by piston rod I29. Piston I28 is drilled and counterbored to form a seat I39, upon which diaphragm I3I is held by elastic split ring I32.

Adapted to reciprocate in a vertical hole in the mixing chamber body member and guided thereby is a pump rod I35 with a riveted bracket I36 provided with slot I3! and downwardly bent ears I38. The piston rod I29 is formed with a head I33 and a neck I34. Diaphragm I3I is a sheet metal stamping provided with a stepped aperture wide enough at I60 to admit the end I64 of the piston rod and narrower at IISI, in the center of the diaphragm, so as to just admit the neck I34 of the piston rod. A spring I39 surrounds the piston rod and is compressed between dia phragm I3! and bracket I36; the top end of the spring is inserted between the ears I38 and the rod and holds the latter against lateral displacement; the lower end of the spring is likewise held by the upturned fingers I40 of the diaphragm. The method of assembling these parts is described in my co-pending application No.

The pump piston is actuated by the throttle through a linkage made up of walking beam I4I, fulcrumed at I42 on the throttle body member, and terminating in a slot to engage pin I43 in the lower slotted end of pump rod I35, of lever I44 fastened to throttle shaft 33 and of connecting link I45, articulated on the walking beam at I46 and on lever I44 at one of the two (or more) holes I41 and I48.

Upon opening the throttle, this linkage will move the pump piston downwards and the fuel in pump cylinder will be forced through channel I49 (Fig. 7) past outlet valve I50 into slanted hole I5I and through accelerating nozzle I52 (Fig. 6) into the main air conduit.

I claim:

1. A pump comprising a body in which is formed a bored hole, a liner slidably inserted in said hole, a resilient gasket in the bottom of said hole and separate friction means acting directly upon said hole to hold said liner in said hole and to compress said gasket.

2. A carburetor accelerating pump comprising a body having a bore, a liner therefor, a resilient gasket in the bottom of said bore and friction means acting directly upon said bore to hold said liner in said bore and to compress said gasket.

3. A pump comprising a body having a bored hole, a liner slidably inserted therein, separate friction means in immediate contact with the wall of said hole and elastically exerting a radial pressure thereon and an abutment between said liner and said friction means whereby said friction means hold the liner in place.

VICTOR. R. I-IEFTLER. 

